Opencv获取视频时长相关信息以及控制播放

int OpencvHelp::getTotalFrame()
{   
    if(m_cap)
        return (int)ceil(m_cap->get(CV_CAP_PROP_FRAME_COUNT)) ;
}

int OpencvHelp::getFps()
{
    if(m_cap)
        return (int)ceil(m_cap->get(CV_CAP_PROP_FPS));
}
void OpencvHelp::setPosPlay(int value)
{
    if(m_cap)
    {
        m_cap->set(CV_CAP_PROP_POS_FRAMES, value);
    }
}
int OpencvHelp::getTotalTimes()
{
    //    时长计算
    if(m_cap)
        return m_cap->get(CV_CAP_PROP_FRAME_COUNT) / m_cap->get(CV_CAP_PROP_FPS);
    
}